/*
 * Copyright (c) 2024 unknowIfGuestInDream.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *     * Neither the name of unknowIfGuestInDream, any associated website, nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UNKNOWIFGUESTINDREAM BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.tlcsdm.core.freemarker;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;

/**
 * @author unknowIfGuestInDream
 */
public class ReadOnlyMemento {
    protected String id;
    protected String type;
    protected Map<String, String> attributes = new HashMap<>();
    protected HashMap<String, Set<Memento>> typeMap = new HashMap<>();
    protected HashMap<String, Set<Memento>> idMap = new HashMap<>();

    public ReadOnlyMemento(String type) {
        this(type, "");
    }

    public ReadOnlyMemento(String type, String id) {
        this.type = type;
        this.id = id;
    }

    public ReadOnlyMemento(ReadOnlyMemento memento) {
        this.type = memento.getType();
        this.id = memento.getId();
        this.attributes = memento.getAttributes();
        this.typeMap = memento.getTypeMap();
        this.idMap = memento.getIdMap();
    }

    public String getType() {

        return this.type;
    }

    public String getId() {

        return this.id;
    }

    public Memento getChild(String type) {
        Collection<Memento> typeChildren = this.typeMap.get(type);
        if (typeChildren == null) {
            return null;
        }

        for (Memento child : typeChildren) {
            return child;
        }

        return null;
    }

    public Memento getChild(String type, String id) {

        Collection<Memento> idChildren = this.idMap.get(id);
        if (idChildren == null) {
            return null;
        }

        for (Memento child : idChildren) {
            if (child.getType().equals(type)) {
                return child;
            }
        }

        return null;
    }

    public Collection<Memento> getChildren() {
        Collection<Memento> children = new LinkedList<>();
        for (Collection<Memento> typeChildren : typeMap.values()) {
            children.addAll(typeChildren);
        }
        return children;
    }

    public Collection<Memento> getChildren(String type) {
        Collection<Memento> typeChildren = new LinkedList<>();
        if (typeMap.containsKey(type)) {
            typeChildren.addAll(typeMap.get(type));
        }
        return typeChildren;
    }

    public boolean contains(String key) {
        return this.attributes.containsKey(key);
    }

    public String getString(String key) {
        if (!contains(key)) {
            return "";
        }

        return this.attributes.get(key);
    }

    public boolean getBoolean(String key) {
        if (!contains(key)) {
            return false;
        }
        return Boolean.valueOf(this.attributes.get(key));
    }

    public String getString(String key, String defaultValue) {
        if (!contains(key)) {
            this.attributes.put(key, String.valueOf(defaultValue));
        }

        return this.attributes.get(key);
    }

    public Collection<String> getAttributeKeys() {
        return Collections.unmodifiableCollection(this.attributes.keySet());
    }

    private Map<String, String> getAttributes() {
        return attributes;
    }

    private HashMap<String, Set<Memento>> getTypeMap() {
        return typeMap;
    }

    private HashMap<String, Set<Memento>> getIdMap() {
        return idMap;
    }
}
